Lamp



FIG. 1 is a rear perspective view showing my new design for a lamp,

FIG. 2 is a front perspective view thereof,

FIG. 3 is a front view thereof,

FIG. 4 is a rear view thereof,

FIG. 5 is a right side view thereof,

FIG. 6 is a left side view thereof; and,

FIG. 7 is a top view thereof.

The ornamental design for a lamp, as shown and described.